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<meta content="$Date: 2002/09/20 21:35:31 $" name="last-changed"/>
<meta content="Henri Gomez" name="author"/>
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<a class="menu" href="jk2/configtc.html">Configuration in the Tomcat</a>
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<a name="General">
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<img border="0" vspace="0" hspace="0" align="left" valign="top" src="images/corner.gif"/>General</td>
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<p class="section">
General Informations and FAQ about JK
</p>
<a name="sub_Where can I get help/support for JK ?">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td align="left" valign="top" class="subsection" bgcolor="#828DA6">
<img border="0" vspace="0" hspace="0" align="left" valign="top" src="images/corner.gif"/>Where can I get help/support for JK ?</td>
</tr>
</table>
</a>
<p class="section">
The primary mechanism for support is through the JK 
documentation included in the doc directory.
Documentation is also available on the Apache Jakarta web site devoted to the
<b>
<a href="http://jakarta.apache.org/builds/jakarta-tomcat-connectors/jk/doc/index.html">
Jakarta Tomcat Connectors Project</a>
</b>
For additional help, the best resource is the Tomcat Users Discussion list.  
You should start by searching
<b>
<a href="http://mikal.org/interests/java/tomcat/index.html">
the mail list archive</a>
</b>
before you post questions to the list.  
If you are unable to locate the answer to your question in the archive, 
you can post questions about JK to the user list for assistance.  
Make sure that you include the version of your Webserver, 
that you are using as well as the platform you are running on
and go 
<b>
<a href="http://jakarta.apache.org/site/mail.html">
here</a>
</b>
to determine how to subscribe to tomcat mailing list.
</p>
<br/>
<a name="sub_I can't find JK anywhere. Where is it?">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td align="left" valign="top" class="subsection" bgcolor="#828DA6">
<img border="0" vspace="0" hspace="0" align="left" valign="top" src="images/corner.gif"/>I can't find JK anywhere. Where is it?</td>
</tr>
</table>
</a>
<p class="section">
Now that JK moved to the <b>
<font color="#333333">jakarta-tomcat-connectors</font>
</b> repository, 
the source and binaries for JK are present 
in the <b>
<a href="http://jakarta.apache.org/builds/jakarta-tomcat-connectors/jk/release/">
jakarta-tomcat-connectors directory</a>
</b>
</p>
<br/>
<a name="sub_What's the difference between JK and mod_jk ?">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td align="left" valign="top" class="subsection" bgcolor="#828DA6">
<img border="0" vspace="0" hspace="0" align="left" valign="top" src="images/corner.gif"/>What's the difference between JK and mod_jk ?</td>
</tr>
</table>
</a>
<p class="section">
<b>
<font color="#333333">JK</font>
</b> is a project covering web-servers to Tomcat connectors,
whereas <b>
<font color="#333333">mod_jk</font>
</b> is the <b>
<a href="jk/aphowto.html">Apache module</a>
</b> developped in JK.
</p>
<p class="section">
<b>
<a href="jk/domhowto.html">Domino webserver</a>
</b> support is implemented on JK, using a redirector
called <b>
<font color="#333333">dsapi redirector</font>
</b>.
</p>
<p class="section">
<b>
<a href="jk/iishowto.html">IIS webserver</a>
</b>support is implemented on JK, using a redirector
called <b>
<font color="#333333">isapi redirector</font>
</b>.
</p>
<p class="section">
<b>
<a href="jk/neshowto.html">Netscape/iPlanet webserver</a>
</b>webserver support is implemented on JK, using a redirector
called <b>
<font color="#333333">nsapi redirector</font>
</b>.
</p>
<br/>
<a name="sub_Where can I get more information ?">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td align="left" valign="top" class="subsection" bgcolor="#828DA6">
<img border="0" vspace="0" hspace="0" align="left" valign="top" src="images/corner.gif"/>Where can I get more information ?</td>
</tr>
</table>
</a>
<p class="section">
For <b>
<font color="#333333">JK 1.2.x</font>
</b>, you should read :
</p>
<ul>
<li>
<b>
<a href="jk/aphowto.html">Apache and JK</a>
</b>
</li>
<li>
<b>
<a href="jk/domhowto.html">Domino and JK</a>
</b>
</li>
<li>
<b>
<a href="jk/iishowto.html">IIS and JK</a>
</b>
</li>
<li>
<b>
<a href="jk/neshowto.html">Netscape/iPlanet and JK</a>
</b>
</li>
<li>
<b>
<a href="jk/workershowto.html">Workers configuration</a>
</b>
</li>
</ul>
<p class="section">
For <b>
<font color="#333333">JK 2.0.x</font>
</b> the <b>
<a href="jk2/configtc.html">
config tomcat</a>
</b> and <b>
<a href="jk2/configweb.html">config webserver</a>
</b>
documents have considerably more in-depth information.
It's worth a look. 
You could also try searching the mailing list archives for "JK" or look at the source.
</p>
<br/>
<a name="sub_Which protocol should I use? Ajp12 or Ajp13?">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td align="left" valign="top" class="subsection" bgcolor="#828DA6">
<img border="0" vspace="0" hspace="0" align="left" valign="top" src="images/corner.gif"/>Which protocol should I use? Ajp12 or Ajp13?</td>
</tr>
</table>
</a>
<p class="section">
<b>
<a href="common/AJPv13.html">Ajp13</a>
</b> is a newer protocol, it's faster, and it works better with SSL. 
You almost certainly want to use it now that ajp12 is deprecated.
</p>
<p class="section"> 
Also ajp13 is supported by all Apache Tomcat including 3.2.x , 3.3.x, 4.0.x, 4.1.x and the new tomcat 5. 
</p>
<p class="section">
Others Servlet engines like <b>
<font color="#333333">jetty</font>
</b> have support for Ajp13.
</p>
<br/>
<a name="sub_I've got a firewall between my WebServer and Tomcat who drop ajp13 connections after some times">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td align="left" valign="top" class="subsection" bgcolor="#828DA6">
<img border="0" vspace="0" hspace="0" align="left" valign="top" src="images/corner.gif"/>I've got a firewall between my WebServer and Tomcat who drop ajp13 connections after some times</td>
</tr>
</table>
</a>
<p class="section">
Ajp13 use persistant connections where the traffic could be null if there is no request to be sent to Tomcat. 
Firewall used to drop inactive connections and will make your WebServer and Tomcat think the connection is valid. 
</p>
<p class="section">
Starting with JK 1.2.0, a <b>
<font color="#333333">socket_keepalive</font>
</b> property as been added to ajp13 settings, and you should take a look at 
it in <b>
<a href="jk/workershowto.html">Workers HowTo</a>
</b>.
</p>
<br/>
<a name="sub_Under heavy load, I've got many threads in Tomcat even if my Apache Web Server handle much of the load">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td align="left" valign="top" class="subsection" bgcolor="#828DA6">
<img border="0" vspace="0" hspace="0" align="left" valign="top" src="images/corner.gif"/>Under heavy load, I've got many threads in Tomcat even if my Apache Web Server handle much of the load</td>
</tr>
</table>
</a>
<p class="section">
Under heavy load, Apache WebServer create many childs to handle the load, which will in turn create many connections 
to Tomcat to forward the requests they should handle. 
Apache WebServer will normally kill the childs/threads when the load decrease. But if the load is still there and 
even if only Apache handle the requests, ie static contents, the childs are kept and with them the ajp13 connections, 
even if they are no more used. 
</p>
<p class="section">
Since JK 1.2.0, <b>
<font color="#333333">cache_timeout</font>
</b> and <b>
<font color="#333333">socket_timeout</font>
</b> properties as been added to close 
connections after some time of inactivity, for more informations refer to <b>
<a href="jk/workershowto.html">Workers HowTo</a>
</b>.
</p>
<br/>
<br/>
<a name="Apache">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td align="left" valign="top" class="section" bgcolor="#525D76">
<img border="0" vspace="0" hspace="0" align="left" valign="top" src="images/corner.gif"/>Apache</td>
</tr>
</table>
</a>
<p class="section">
Informations and FAQ about mod_jk and Apache Web Servers. 
</p>
<a name="sub_Whenever I restart Tomcat, Apache locks up!">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td align="left" valign="top" class="subsection" bgcolor="#828DA6">
<img border="0" vspace="0" hspace="0" align="left" valign="top" src="images/corner.gif"/>Whenever I restart Tomcat, Apache locks up!</td>
</tr>
</table>
</a>
<p class="section">
The Ajp13 protocol keeps an open socket between Tomcat and Apache. Release of mod_jk present in J-T-C handle the network failure. 
But with previous release of mod_jk, you may have to restart Apache as well.
</p>
<br/>
<a name="sub_Why did exist two files mod_jk.so (-eapi ad -noeapi) in download dir for Linux ?">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td align="left" valign="top" class="subsection" bgcolor="#828DA6">
<img border="0" vspace="0" hspace="0" align="left" valign="top" src="images/corner.gif"/>Why did exist two files mod_jk.so (-eapi ad -noeapi) in download dir for Linux ?</td>
</tr>
</table>
</a>
<p class="section">
Many versions of Apache use of modified API, known at Extended API, developped for use with the
<b>
<a href="http://www.modssl.org">mod_ssl module</a>
</b>.
</p>
<p class="section">
For example, Apache present in certains recent Linux distributions include the
<b>
<font color="#333333">mod_ssl</font>
</b> module.
</p>
<p class="section">
So if you got such 'Extended Apache', you need to use <b>
<font color="#333333">mod_jk.so-eapi</font>
</b>.
</p>
<p class="section"> 
You should use <b>
<font color="#333333">mod_jk.so-noeapi</font>
</b> only for 'Standard Apache' (ie without mod_ssl).
</p>
<p class="section">
It's wise to avoid using EAPI modules on STD API Apache or to use standard API modules on EAPI Apache. 
Allways be sure to have the <b>
<font color="#333333">mod_jk.so</font>
</b> witch match your version of Apache
</p>
<br/>
<a name="sub_What's that message about 'garbled DSO ?'">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td align="left" valign="top" class="subsection" bgcolor="#828DA6">
<img border="0" vspace="0" hspace="0" align="left" valign="top" src="images/corner.gif"/>What's that message about 'garbled DSO ?'</td>
</tr>
</table>
</a>
<p class="section">
It's related to Apache EAPI, the message <b class="code">'mod_jk.so is garbled - perhaps this is not an Apache module DSO ?'</b> 
just told you, that your're trying to install a mod_jk.so DSO module that was compiled on an Apache using EAPI, 
like apache-mod_ssl or apache from Redhat distro 6.2/7.0 but your system use the standard apache with normal API.
</p>
<br/>
<a name="sub_And the message about 'module might crash under EAPI!">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td align="left" valign="top" class="subsection" bgcolor="#828DA6">
<img border="0" vspace="0" hspace="0" align="left" valign="top" src="images/corner.gif"/>And the message about 'module might crash under EAPI!</td>
</tr>
</table>
</a>
<p class="section">
Also related to EAPI, the message <b class="code">'[warn] Loaded DSO /usr/lib/apache/mod_jk.so uses plain Apache 1.3 API, 
this module might crash under EAPI! (please recompile it with -DEAPI)'</b>, the mod_jk.so was compiled under normal 
Apache with standard API and you try to install the module on an Apache using EAPI.
</p>
<br/>
<a name="sub_APXS is getting an error during the build of mod_jk, like rc=0 or rc=255.  I tried all of the steps in the build section, what do I do now ?">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td align="left" valign="top" class="subsection" bgcolor="#828DA6">
<img border="0" vspace="0" hspace="0" align="left" valign="top" src="images/corner.gif"/>APXS is getting an error during the build of mod_jk, like rc=0 or rc=255.  I tried all of the steps in the build section, what do I do now ?</td>
</tr>
</table>
</a>
<p class="section">
APXS is a Perl script that is created when you build the Apache web server from source.  
Chances are that if you are getting these errors and you obtained Apache as a binary distribution, 
that APXS is not configured correctly for your system.  
Your best bet is to get the Apache source from http://httpd.apache.org and build it yourself.  
Use the following for a basic build (read the Apache docs for other options):
<p class="screen">
<div align="center">
<table bgcolor="#cccccc" cellpadding="2" cellspacing="0" border="1" width="80%">
<tr>
<td align="left" bgcolor="#cccccc">
<code>
<nobr>
<em class="screen">[user@host] ~ $ </em>
<b class="screen">cd /usr/local/src</b>
</nobr>
</code>
<br/>
<code>
<nobr>
<em class="screen">[user@host] ~ $ </em>
<b class="screen">gzip -dc apache_1.3.19.tar.gz|tar xvf -</b>
</nobr>
</code>
<br/>
<code>
<nobr>
<em class="screen">[user@host] ~ $ </em>
<b class="screen">cd apache_1.3.19</b>
</nobr>
</code>
<br/>
<code>
<nobr>
<em class="screen">[user@host] ~ $ </em>
<b class="screen">./configure --prefix=/usr/local/apache \</b>
</nobr>
</code>
<br/>
<code>
<nobr>
<em class="screen">[user@host] ~ $ </em>
<b class="screen">            --enable-module=most \</b>
</nobr>
</code>
<br/>
<code>
<nobr>
<em class="screen">[user@host] ~ $ </em>
<b class="screen">            --enable-shared=max</b>
</nobr>
</code>
<br/>
<code>
<nobr>
<em class="screen">[user@host] ~ $ </em>
<b class="screen">make</b>
</nobr>
</code>
<br/>
<code>
<nobr>
<em class="screen">[user@host] ~ $ </em>
<b class="screen">make install</b>
</nobr>
</code>
<br/>
</td>
</tr>
</table>
</div>
</p>
</p>
<p class="section">
Note: The above steps assume that you downloaded the Apache source and placed it in your /usr/local/src directory.
</p>
<br/>
<a name="sub_Apache 2.0 complains about incorrect module version">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td align="left" valign="top" class="subsection" bgcolor="#828DA6">
<img border="0" vspace="0" hspace="0" align="left" valign="top" src="images/corner.gif"/>Apache 2.0 complains about incorrect module version</td>
</tr>
</table>
</a>
<p class="section">
Since Apache 2.0 API still change often, the Apache 2.0 teams decide to put in headers of compiled modules the 
Apache 2.0 version used to compile the module. 
</p>
<p class="section">
At start time Apache 2.0 check that version in modules headers and stop if it detect that a module was compiled 
for another Apache 2.0 version. As such you should allways use modules compiled for the same Apache 2.0 version. 
This check may be removed if the future.
</p>
<br/>
<a name="sub_JNI didn't works with Apache 1.3">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td align="left" valign="top" class="subsection" bgcolor="#828DA6">
<img border="0" vspace="0" hspace="0" align="left" valign="top" src="images/corner.gif"/>JNI didn't works with Apache 1.3</td>
</tr>
</table>
</a>
<p class="section">
JNI support require a multi-threaded environment which is not the general case for Apache 1.3. 
You should verify if Apache 1.3 has been build with thread support and if not you could add the 
the pthreads library to your <b>
<font color="#333333">httpd.conf</font>
</b> file. 
</p>
<p class="screen">
<div align="center">
<table bgcolor="#cccccc" cellpadding="2" cellspacing="0" border="1" width="80%">
<tr>
<td align="left" bgcolor="#cccccc">
<div class="screen"># Add pthread to Apache in httpd.conf</div>
<code class="screen">
<nobr>LoadModule "/usr/lib/libpthreads.so"</nobr>
</code>
<br/>
</td>
</tr>
</table>
</div>
</p>
<p class="section">
Also keep in mind that JNI is suited for multi-threaded servers and you should consider upgrading 
to Apache 2.0 to support JNI.
</p>
<br/>
<a name="sub_JNI report that JVM couldn't be started under Linux">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td align="left" valign="top" class="subsection" bgcolor="#828DA6">
<img border="0" vspace="0" hspace="0" align="left" valign="top" src="images/corner.gif"/>JNI report that JVM couldn't be started under Linux</td>
</tr>
</table>
</a>
<p class="section">
Under Linux, you should set some environment variables BEFORE launching your Apache server :
</p>
<p class="screen">
<div align="center">
<table bgcolor="#cccccc" cellpadding="2" cellspacing="0" border="1" width="80%">
<tr>
<td align="left" bgcolor="#cccccc">
<code class="screen">
<nobr>export LD_LIBRARY_PATH=$jre/bin:$jre/bin/classic:$LD_LIBRARY_PATH</nobr>
</code>
<br/>
</td>
</tr>
</table>
</div>
</p>
<p class="section">
Also some Linux distributions have enabled a GLIBC feature called 'floating stacks' which may not works with kernel 
less than 2.4.10 on SMP machines. You should disable floating stacks by exporting an environment variable :
</p>
<p class="screen">
<div align="center">
<table bgcolor="#cccccc" cellpadding="2" cellspacing="0" border="1" width="80%">
<tr>
<td align="left" bgcolor="#cccccc">
<code class="screen">
<nobr>export LD_ASSUME_KERNEL=2.2.5</nobr>
</code>
<br/>
</td>
</tr>
</table>
</div>
</p>
<p class="section">
You could have to update your service scripts, ie <b>
<font color="#333333">/etc/rc.d/init.d/httpd</font>
</b>, to set these env vars 
before your httpd server starts.
</p>
<br/>
<br/>
<a name="IIS">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td align="left" valign="top" class="section" bgcolor="#525D76">
<img border="0" vspace="0" hspace="0" align="left" valign="top" src="images/corner.gif"/>IIS</td>
</tr>
</table>
</a>
<p class="section">
Informations and FAQ about JK and IIS Web Servers. 
</p>
<p class="todo">
      This paragraph has not been written yet, but <b>you</b> can contribute to it.
      </p>
<br/>
<a name="NES/iPlanet">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td align="left" valign="top" class="section" bgcolor="#525D76">
<img border="0" vspace="0" hspace="0" align="left" valign="top" src="images/corner.gif"/>NES/iPlanet</td>
</tr>
</table>
</a>
<p class="section">
Informations and FAQ about JK and NES/iPlanet Web Servers. 
</p>
<p class="todo">
      This paragraph has not been written yet, but <b>you</b> can contribute to it.
      </p>
<br/>
</td>
</tr>
</table>
</body>
</html>
